CN113683344A

CN113683344A - Normal-temperature rapid repairing material for track disease of asphalt pavement and repairing method thereof

Info

Publication number: CN113683344A
Application number: CN202110948756.9A
Authority: CN
Inventors: 朱光达; 代强波; 戴军翔; 李志锋; 黄云开; 温贤涛
Original assignee: Guangdong Huihang Construction Engineering Co ltd
Current assignee: Guangdong Huihang Construction Engineering Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2021-11-23

Abstract

The invention relates to the technical field of pavement rut repair, in particular to a normal-temperature rapid repair material for asphalt pavement rut diseases and a repair method thereof. The raw materials of the rapid repair material comprise modified emulsified asphalt, rapid cement, coarse aggregate and fine aggregate. The rapid repair material provided by the invention is mixed without adding water, the emulsified asphalt is demulsified to form strength, water required by cement hydration is provided, the rapid cement has the activity to promote the demulsification of the emulsified asphalt, and the rapid cement and the emulsified asphalt can accelerate the final setting time of the repair material and rapidly improve the early strength; the high-strength asphalt pavement track pit repairing agent is suitable for repairing asphalt pavement track pits with high traffic volume and serious overload, has the characteristics of no need of traffic closure, high early strength, good toughness, strong binding power, strong durability and impact resistance, small influence of the construction on the environment and the like, and can form strength after being mixed for 20 minutes.

Description

Normal-temperature rapid repairing material for track disease of asphalt pavement and repairing method thereof

Technical Field

The invention relates to the technical field of pavement rut repair, in particular to a normal-temperature rapid repair material for asphalt pavement rut diseases and a repair method thereof.

Background

With the vigorous development of economic construction and urban modernization in China, road traffic facilities are rapidly developed as key projects in the last 30 years. By the end of 2020, the total highway mileage in China is 519.81 kilometers, the highway density is 54.15 kilometers per hundred square kilometers, the total highway maintenance mileage also reaches 514.40 kilometers and accounts for 99.0 percent of the total highway mileage, and the development of the highway industry is changed from the prior 'construction as a main' to 'maintenance and repair combination'. Therefore, the main problem of highway construction in China at the present stage is how to repair the 'problem road surface' by adopting an effective means, so that the driving safety and the comfort of the 'problem road surface' are improved, and the service life of the 'problem road surface' is prolonged so as to achieve the purpose of saving the maintenance cost.

Through the research of asphalt pavement disease data and the field disease survey, it can be found that the rut pit slot is one of the common damage forms of the asphalt pavement. In the daily maintenance and repair work of asphalt pavement, the maintenance work of the rut pit slot is frequent, is easily influenced by traffic volume and external environment, and has higher maintenance difficulty, and if the rut pit slot is not repaired in time, the damage of the pavement can be accelerated, and the vehicle and a driver are threatened greatly. Practice shows that the traditional repairing material is not suitable for complex weather conditions of high temperature and raininess of urban main road heavy-load traffic pavements and wet and hot areas, the use requirement of pavement durability cannot be met, the problems of low early strength, easy premature damage, water damage and the like after the rut pit grooves of the heavy-load traffic pavements are repaired are very common and prominent, if the potential safety hazards are not solved in time, road congestion can be caused, even malignant traffic accidents are induced, and the problems that later strength attenuation is often ignored when the traditional repairing material is used for repairing, and obvious color difference exists between a repairing area and the original pavement and the like are solved.

In conclusion, the traditional repair materials are divided into hot-mix asphalt mixtures and cold-mix asphalt mixtures, the hot-mix asphalt mixtures have high temperature sensitivity and high requirements on construction environments, the quality of repair construction in a low-temperature wet state is difficult to control, the repair effect depends on the quality of repair equipment and repair constructors to a great extent, and the uncontrollable factors of the repair quality are more; the cold-mixed asphalt mixture has the defects of low early strength, insufficient compactness of the mixture, easy peeling, secondary damage and the like; in addition, the aesthetic effect of the repaired pavement is not considered in the traditional two repairing materials, and the repaired area has larger color difference with the original pavement. The traditional asphalt pavement rut pit slot cold-patch material has the problems of slow increase of early strength, long condensation time, poor mixing performance, attenuation of later strength, easy falling off under the impact action of vehicles, easy generation of secondary damage, poor repair aesthetic effect and the like.

The invention provides a material for quickly repairing an asphalt pavement track disease at normal temperature and a repairing method thereof, aiming at the defect of insufficient performance of the existing asphalt pavement track pit slot cold-repairing material.

Disclosure of Invention

The invention aims to provide a material for quickly repairing rut diseases on an asphalt pavement at normal temperature and a repairing method thereof, so as to solve the problems in the background technology.

In order to achieve the above purpose, in one aspect, the invention provides a normal-temperature rapid repairing material for rut diseases on an asphalt pavement, which comprises the following raw materials: modified emulsified asphalt, rapid cement, coarse aggregate and fine aggregate, wherein the mass ratio of the materials is 1.0:1.2-1.6:5.5-5.9: 3.6-4.0;

the modified emulsified asphalt is slow-breaking type cation modified emulsified asphalt and comprises the following components in percentage by weight: 51-55% of asphalt, 1.5-2.2% of cationic emulsifier, 5.0-5.5% of modifier, 3.1-5.0% of pH regulator and the balance of water;

the quick cement comprises sulphoaluminate cement, an early strength water reducing agent, basalt fiber and a toner.

As a further improvement of the technical proposal, the sulphate aluminum cement is marked as R.SAC 42.5, and the 28-day strength is more than or equal to 42.5 MPa.

As a further improvement of the technical scheme, the specification of the coarse aggregate is 4.75-13.2mm, and the coarse aggregate is selected from one of stone and rice, limestone and granite broken stone; the specification of the fine aggregate is 0-4.75mm, the fine aggregate is selected from one of machine-made sand, clean stone chips, river sand and sea sand produced by alkaline stone, according to the repairing thickness of the asphalt pavement, particles with the particle size of 2/3 ultra-thick layers must be screened out, and the amount of the synthetic mineral aggregate passing through a 4.75mm sieve is not less than 50%.

As a further improvement of the technical scheme, the early strength water reducing agent is selected from a high-efficiency polycarboxylic acid water reducing agent, the water reducing rate is more than or equal to 15 percent, and the gas content is less than or equal to 3.5 percent.

As a further improvement of the technical scheme, the toner is carbon black, and the tinting strength of the toner is 100-120%.

As a further improvement of the technical scheme, the basalt fiber can be selected from basalt or other varieties according to actual requirements, and has various mixing amounts.

In another aspect, the present invention provides a method for repairing a rut pit of an asphalt pavement by using the above-mentioned material, which is characterized by comprising the following steps:

s1, determining the optimal mixing ratio of the repair materials according to the site environment and the construction conditions;

s2, preparing quick cement in advance; preparing coarse aggregate and fine aggregate to prepare aggregate, wherein the aggregate needs to be kept dry; the used asphalt road milling material is recommended to be recycled, so that the environment is protected, the energy is saved, and the effect is better;

s3, predetermining a repairing window according to the size range and the depth of a rutting pit groove, wherein the window range is expanded by 9-11cm to the periphery according to the actual range of surface defects, in order to enhance the aesthetic appearance of the repairing, a milling machine is used for milling a new interface or a cutting machine is used for cutting the repairing window into rectangles, the four sides of each rectangle are perpendicular to or parallel to the marked lines of the pavement, the operation boundary of the milling machine is used for improving the repairing appearance, milling can be omitted in emergency treatment, and construction can be carried out as long as damaged loose materials in an old asphalt road are slightly removed;

s4, milling or chiseling loose mixture in the asphalt pavement patching window, cleaning the patching range by using a blower and a cleaning tool, being not afraid of the wetness of a patching base surface, removing accumulated water, not needing to demulsify by using equal-viscosity layer oil, removing broken stone and dust in the window, and uniformly spreading emulsified asphalt as an interface bonding material;

s5, dry-mixing the aggregate and the prepared quick cement for 50-70S according to the mixing proportion, directly adding the modified emulsified asphalt without adding water, continuously stirring for 50-70S to obtain a quick repairing material, then uniformly spreading the quick repairing material in a repairing window, wherein the square coefficient is 1.4, and leveling and compacting; the stirring and the spreading can be operated mechanically or manually;

and S6, compacting by adopting a three-ton smooth-wheel road roller, and opening traffic after the surface of the repair material is solidified without obvious moisture.

Preferably, in the step S2, the aggregate can be recycled by preferentially adopting an old asphalt road milling material, and the method is environment-friendly, energy-saving, better in effect, less prone to cracking and better in color.

Preferably, in the step S5, the repair material is mixed without adding water, the emulsified asphalt is demulsified to provide water for cement hydration to form strength, and the activity of the cement is to promote the demulsification of the emulsified asphalt, so that the activity of the cement and the demulsification of the emulsified asphalt can be combined to quickly improve the early strength of the repair material.

Preferably, in S6, the rapid repair material may be used for rapidly restoring the function of the pavement by adding emulsified asphalt from the beginning to the end of compaction for 25-35min under the precondition of performing the mixing proportion and material drying.

Compared with the prior art, the invention has the beneficial effects that:

1. in the normal-temperature quick repair material for the rutting diseases of the asphalt pavement and the repair method thereof, the strength of the used quick repair material is mainly provided by the quick cement hydration and the asphalt bonding effect after the modified emulsified asphalt is demulsified; the repair material is mixed without adding water, the emulsified asphalt provides water for cement hydration to form strength after demulsification, the activity of the cement promotes the demulsification of the emulsified asphalt, and the cement and the emulsified asphalt both accelerate the final setting time of the repair material and rapidly improve the early strength. The rapid cement hydration reaction and the modified emulsified asphalt demulsification are carried out simultaneously, and the rapid cement hydration reaction and the modified emulsified asphalt demulsification are mutually promoted under the condition of each other.

2. In the normal-temperature quick repair material for the track disease of the asphalt pavement and the repair method thereof, the quick repair material is suitable for asphalt pavement pit slots with high traffic volume and serious overload, has the characteristics of quick open traffic, initial setting and final setting, high early strength, good toughness, strong durability and impact resistance, small environmental influence and the like, can be used as a vehicle for passing while, does not need to close traffic, can open traffic within 25-35min, is suitable for the color of the original asphalt pavement, has strong cohesive force and good integrity, can effectively reduce the probability of secondary damage after the repair of the asphalt pavement pit slots, and achieves better asphalt pavement pit slot repair effect.

Drawings

Fig. 1 is a flow chart of a repairing method in embodiment 1 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiment 1 a normal-temperature rapid repairing material for rut diseases on asphalt pavement and a repairing method thereof, comprising the following steps:

first, material preparation

Selecting modified emulsified asphalt, rapid cement, coarse aggregate and fine aggregate with the mass ratio of 1.0:1.2-1.6:5.5-5.9: 3.6-4.0;

the modified emulsified asphalt is slow-breaking type cation modified emulsified asphalt and comprises the following components in percentage by weight: 51-55% of asphalt, 1.5-2.2% of cationic emulsifier, 5.0-5.5% of modifier, 3.1-5.0% of pH regulator and the balance of water; the rapid cement comprises sulphoaluminate cement, an early strength water reducing agent, basalt fiber and a toner; the specification of the coarse aggregate is 4.75-13.2mm, and the coarse aggregate is selected from one of stone rice, limestone and granite broken stone; the specification of the fine aggregate is 0-4.75mm, the fine aggregate is selected from one of machine-made sand, clean stone chips, river sand and sea sand produced by alkaline stone, according to the repairing thickness of the asphalt pavement, particles with the particle size of 2/3 ultra-thick layers must be screened out, and the aggregate amount of the synthetic mineral aggregate passing through a 4.75mm sieve is not less than 50%.

The grade of the sulphoaluminate cement is R.SAC 42.5, and the 28-day strength is more than or equal to 42.5 MPa; the early strength water reducing agent is selected from high-efficiency polycarboxylic acid water reducing agents, the water reducing rate is more than or equal to 15 percent, and the gas content is less than or equal to 3.5 percent; the toner is carbon black, and the tinting strength of the toner is 100-120%.

Fast cement composite base material mix (no asphalt state) performance:

description of the drawings: a. the operation time refers to the time from the beginning of adding water and stirring the materials to the time when the materials lose plasticity, the setting time from the beginning of adding water and stirring the materials to the time when the materials are in a hardening state, the number in the table is a numerical value in high-temperature weather (outdoor 40 ℃), and the temperature is increased by 5-15 minutes when the temperature is low;

b. the 1 hour intensity is calculated starting after solidification and so on.

Second, repairing method

Step 1, determining the optimal mixing proportion of the repairing material according to the site environment and the construction conditions;

step 2, preparing quick cement in advance; preparing coarse aggregates and fine aggregates to prepare aggregates, wherein the aggregates can be milled and planed by preferably adopting an old asphalt road, and are recycled, so that the aggregate is environment-friendly, energy-saving, good in effect, not easy to crack, good in color and luster, and the sandstone materials are kept dry; the used asphalt road milling material is recommended to be recycled, so that the environment is protected, the energy is saved, and the effect is better;

step 3, predetermining a repairing window according to the size range and the depth of the rutting pit groove, wherein the window range is expanded by 9-11cm to the periphery according to the actual range of the surface defect, in order to enhance the aesthetic appearance of the repairing, a milling machine is used for milling a new interface or a cutting machine is used for cutting the repairing window into rectangles, the four sides of each rectangle are perpendicular to or parallel to the pavement marking, the operation boundary of the milling machine is used for improving the repairing appearance, milling can be omitted in emergency treatment, and construction can be carried out as long as damaged loose materials in an old asphalt road are slightly removed;

step 4, milling or chiseling loose mixture in the asphalt pavement patching window, cleaning the patching range by using an air blower and a cleaning tool, being not afraid of the wetness of a patching base surface, removing accumulated water, not needing to demulsify by using equal-viscosity layer oil, removing broken stone and dust in the window, and uniformly spreading emulsified asphalt as an interface bonding material;

and 5, dry-mixing the aggregate and the prepared quick cement for 50-70s according to the mixing proportion, adding the modified emulsified asphalt, continuously stirring for 50-70s to obtain the quick repairing material, mixing the repairing material without adding water, demulsifying the emulsified asphalt to provide water required by cement hydration to form strength, promoting the demulsification of the emulsified asphalt by the activity of the cement, and rapidly improving the final setting time and the early strength of the repairing material by the aid of the aggregate and the emulsified asphalt. Then uniformly spreading the mixture in a repairing window, wherein the square loosening coefficient is 1.4, and leveling and compacting; the stirring and the spreading can be operated mechanically or manually; the slurry seal vehicle is adopted to mix materials during large-area and large-volume construction, the effect is very good, the materials are mixed uniformly, and the speed is high.

And 6, compacting by adopting a three-ton smooth-wheel road roller, opening traffic after the surface of the repairing material is solidified without obvious moisture, adding emulsified asphalt into the quick repairing material from the beginning and mixing to the completion of compacting for 25-35min under the precondition of executing mix proportion and material drying, and opening the traffic, wherein the quick repairing material can be used for quickly recovering the function of a thin layer (1cm) on the surface of a track.

Comparative example 1

First, material preparation

Selecting emulsified asphalt, ordinary Portland cement, coarse aggregate and fine aggregate with the mass ratio of 1.0:1.2-1.6:5.5-5.9: 3.6-4.0;

wherein the coarse aggregate has a size of 4.75-13.2mm, and is selected from one of stone and rice, limestone and granite macadam; the specification of the fine aggregate is 0-4.75mm, the fine aggregate is selected from one of machine-made sand, clean stone chips, river sand and sea sand produced by alkaline stone, according to the repairing thickness of the asphalt pavement, particles with the particle size of 2/3 ultra-thick layers must be screened out, and the amount of the synthetic mineral aggregate passing through a 4.75mm sieve is not less than 50%.

Second, repairing method

step 2, preparing coarse aggregates and fine aggregates to prepare aggregates, wherein the aggregates can be recycled by preferentially adopting old asphalt road milling materials, the aggregate is environment-friendly and energy-saving, has better effect, is not easy to crack and has better color, and the sandstone materials are kept dry; the used asphalt road milling material is recommended to be recycled, so that the environment is protected, the energy is saved, and the effect is better;

step 5, dry-mixing the aggregate and the common cement for 50-70s according to the mixing proportion, adding the emulsified asphalt, continuously stirring for 50-70s, adding water, mixing to obtain a repair material, uniformly spreading the repair material in a repair window with a square loosening coefficient of 1.4, leveling and compacting; the stirring and the spreading can be operated mechanically or manually;

and 6, compacting by adopting a three-ton smooth-wheel road roller, and opening the traffic after the surface of the repairing material is solidified without obvious moisture.

The normal-temperature quick repairing material for the rut diseases of the asphalt pavement has quick final setting time and better strength, and can quickly open traffic after pavement repairing.

In order to verify the relevant technical scheme, the applicant carries out the following tests on the repair key material rapid cement prepared in example 1 and comparative example 1, and the test results are shown in tables 1 to 2:

TABLE 1

As shown in table 1, the repair material prepared in example 1 of the present invention has better bending strength and compressive strength than the repair material of comparative example 1, and the strength is higher in example 1 with the passage of time, while the width is not significant in comparative example 1, and the road traffic open time is 1 times earlier than that of comparative example 1 after the repair material is used, so it can be shown that the repair material of the present invention has better strength and faster repair speed; TABLE 2

As shown in table 2, the repair material prepared in example 1 of the present invention has better adhesion than the repair material prepared in comparative example 1, and the adhesion of example 1 is more remarkably increased with time, so it can be shown that the repair material prepared by the formulation of the present invention has better adhesion.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The normal-temperature rapid repairing material for the track disease of the asphalt pavement is characterized by comprising the following raw materials: modified emulsified asphalt, rapid cement, coarse aggregate and fine aggregate, wherein the mass ratio of the materials is 1.0:1.2-1.6:5.5-5.9: 3.6-4.0;

2. The normal-temperature rapid repair material for rutting diseases on the asphalt pavement according to claim 1, which is characterized in that: the 28-day strength of the sulphoaluminate cement is more than or equal to 42.5 MPa.

3. The normal-temperature rapid repair material for rutting diseases on the asphalt pavement according to claim 1, which is characterized in that: the specification of the coarse aggregate is 4.75-13.2mm, and the coarse aggregate is selected from one of stone rice, limestone and granite broken stone; the fine aggregate has a specification of 0-4.75mm, and is selected from one of machine-made sand, clean stone chips, river sand and sea sand produced from alkaline stone.

4. The normal-temperature rapid repair material for rutting diseases on the asphalt pavement according to claim 1, which is characterized in that: the early strength water reducing agent is selected from a high-efficiency polycarboxylic acid water reducing agent, the water reducing rate is more than or equal to 15 percent, and the gas content is less than or equal to 3.5 percent.

5. The normal-temperature rapid repair material for rutting diseases on the asphalt pavement according to claim 1, which is characterized in that: the toner is carbon black, and the tinting strength of the toner is 100-120%.

6. A method for repairing the asphalt pavement rut pit groove rapid repair material according to claims 1-5, which is characterized by comprising the following steps:

s2, preparing quick cement in advance; preparing aggregate from coarse aggregate and fine aggregate, and keeping the sandstone material dry;

s3, predetermining a repairing window according to the size range and the depth of the rutting pit groove, wherein the window range is enlarged by 9-11cm towards the periphery according to the actual range of the surface defect;

s4, milling or chiseling loose mixture in the asphalt pavement repairing window, cleaning the repairing range by using a blower and a cleaning tool, removing broken stones and dust in the window, and uniformly spreading emulsified asphalt as an interface bonding material;

s5, dry-mixing the aggregate and the prepared quick cement for 50-70S according to the mixing proportion, adding the modified emulsified asphalt, continuously stirring for 50-70S to obtain a quick repairing material, then uniformly spreading the quick repairing material in a repairing window, wherein the loose square coefficient is 1.4, and leveling and compacting;

7. The method for repairing the normal-temperature rapid repair material for the rut diseases on the asphalt pavement according to claim 7, which is characterized by comprising the following steps: in the step S2, the aggregate can be preferably used as an old asphalt road milling material.

8. The method for repairing the normal-temperature rapid repair material for the rut diseases on the asphalt pavement according to claim 7, which is characterized by comprising the following steps: in the S5, the repair material is mixed without adding water.

9. The method for repairing the normal-temperature rapid repair material for the rut diseases on the asphalt pavement according to claim 7, which is characterized by comprising the following steps: in the step S6, the rapid repair material is added with emulsified asphalt from the beginning and mixed to be compacted for 25-35min under the precondition of executing the mixture ratio and the material drying, and then heavy traffic is opened.